DE1303565B - - Google Patents

Description

The Hrlhuiuiu:! Weight aiii a Gleitruindich-UiiU 'for oil pumps. in which two concentric sliding channels connected in the sealing path h üereinaiulci swivel resiliently pressed against a nenieinsanie gene running disc. where tier according to:., switched second (Hcilrinn supports springy on the ice, the cine G 'ι! caught in one forehead · ¹ ί Au-spamim of the other is disordered and jeeer Gleiirini; on a circumference a Dichirini: iiänt.

¹ s Ki ei'.i 'ileili inndichtunn this old known for Hölicic l'iiieke. Ki der der im Diehnvc ;. ' . first- · (ileiiiinn -liruseitinen in a stretched out of the two-en 'ileitru !!;? s is anneoidnel The second Gleitrini ¹ Müizt sii-h mil aid of a sealing ring on the shaft and the first slip ring with the aid of a sealing ring on the.. Heide slide channels are arranged at a distance from the wall of the housing bore hole that is under pressure. The slide channels are roughly equivalent to each other. There should be approximately the same pressure drop on their slide surface!). The end faces of both slide channels opposite the sliding surfaces are under the flow of the ah / 11 (hollow pressure, (British patent specification 'Mn M) I).

Is is also a sliding ring seal, in particular fin f'i; ise known Ki der / white con / entrisi he equilibrium

Linge are provided, of which the outer has a greater axial length than the inner sliding ring and a sealing ring as an extension of the inner sliding ring is arranged. The Slüi / iing sii / .t with the interposition a single sealing ring on the shaft, the outer sliding ring is via a second sealing ring on the support ring and the inner slip ring is over a third sealing ring is supported on the outer sliding ring. In the sealed Zvwscheiraiim between the two sliding rings a pressurized lubricant is introduced, which the Sliding surface !! lubricate and prevent the gas from escaping rope. This mechanical seal can be inside or outside the area to be sealed ». In one case the outer and the im In another case, the inner sliding ring in addition to the force of a spring by the pressure of the seal to be sealed Medium pressed against the counter-rotating disk, while the other sliding ring does not have any additional Pressure is exposed (German Patent 967 096).

The series connection of two sliding ring surfaces provides increased security, since in the event of failure one poetry, the other still remains effective. On the other hand, if one of the sealing rings fails the medium to be sealed enters the open unhindered.

The invention is based on the object of providing a mechanical seal for oil pumps of the type described in the introduction Specify the type that offers greater security when sealing.

This object is achieved according to the invention by the combination of the following features:

a) The second sliding ring is in one through a frontal recess of the first sliding ring. the counter-rotating disk and the circumference of the WeIb or the housing bore limited space arranged, and

b) both slip rings are via their D'ichirings themselves aligning supported on the shaft or on the housing.

In this construction, two sealing gauges are connected in series along the shaft or the housing bore. If one sealing ring fails, the other sealing ring is still effective. Hence c.'ibl

Ii not just in terms of the glass surfaces. but double security also with regard to the seal. The first Gleiirini in the Diclitvcn; will not only tlu eh his! etlci. -by also through the pressure de · contaminated with the oil to be sealed. At his GIeH-lliiche e:.! is therefore a very high area pressure kit. ", The poetry that makes an aiilJeiortlentlicli: leads. I 'ot / dcm there is no excessive wear on the (ileitllächc. Because the ö' for a permanent S.'hmieruni: sorrows. When these brands seal there is barely zo.r-i hen the two sliding rings impression. d "i '-'eh only'. '. etiin vi in atmospheric Pressure is different. The second dlcitring is there only under the fin flow of the associated leather and this low pressure seal, even if the surface pressure on this sliding surface is selected in this way. that they are not excessive Abniit / uni: learns even if not through oil !. 'cschnikrt is. Furthermore, the construction has the \; iitcil. 'leave each slip ring on its own Tightly rinn is supported in a self-aligning manner and is therefore unreuelmic wedges on the surface of the

! 303 565

3 4

(iegenlaiiischeibe independent mhd all sliding ring on shaft 1 reads connected abutment 17, tlas itself

Can be inappropriate. via tlas thrust bearing 8 on the housing 2 support / l

It is particularly favorable if the ilen Gleilring 18 in a Gleiiring Gleiirinu 18 and a Fetler 19 »Helming, with this material, the two sliding rings press against the Ringabsehnill 20 of the sliding surface 16. jK'gcnüheiliegcndcn counter-rotating disk (therllächc 5 abutment 17 and sliding ring 18 are standardized by a is, it is ensured that the material of the toothing 21 rotatably connected to one another. Of the the two cables are so different Is that on the first sliding surface a material is supported on the shaft I, that.! he himself mil Pairing higher wear resistance and aligns with the reference to the vertical sliding surface 16, ! ". wide sliding surface a material pairing lower io A prolil ring can be used as a sealing ring, Heibung, preferably with noise-free properties, for example a ring with three sealing lips results. For example, one can apply in connection with tier shaft.

a counter-rotating disk made of soft steel or cast iron The sliding ring! 8 is a first sliding ring, the one

iron or made of another carrier material, on the frontal recess 23, in which a

Uem a wear-resistant layer, e.g. B. made of molybdenum, 15 second sliding ring 24 is arranged by means of a

Metal or ceramic, is applied, a Diehtriiiüs 25 also self-aligning on the

harvest clearing from hard-wearing material. e.g. shaft 1 is held. A plate spring 26 presses the

I inert synthetic carbon and a second sliding ring, second sliding ring 24 s'. Against a second section

to the plastic, e.g. polytetrafluoroethylene, with the sliding surface 16 in 20a. Z \ visc ^K : n den. both sliding

Use molybdenum contained in the pores. 20 rings 18 and 24 remains an ilyum27. The second

In a further embodiment of the F.rfinduhg recommends sliding ring 24 is over a toothing 28 or

Cs itself, the space between the two sliding rings claw coupling in the rotary movement> 'om first

Unit to connect an outwardly leading channel slide ring 18.

the. the one with the pump suction line in connection B. ■ In this arrangement, the first sliding ring works

Stands. The oil 25 18 seeping past the first seal ring in the usual manner, d. i.e., he seals the oil up to

* irtl then immediately back to the pump suction line - a few drops per day. The second sliding ring »24

| e-filled. Appropriately, in the connection ^ - hai is only to ensure that this small amount of oil,

|: A non-return valve is provided in the anal area, which is also not under any strong pressure

tlTiict if the pressure in the space between the one to prevent it from escaping to the outside. The second

ticiden slip rings over a predetermined distance 30 slip ring 24 is only under the force of the spring 26;

• rises. Have pressure fluctuations in the sealing chamber 5

The fulfillment will not have any noticeable influence on him in the following on the basis of three. He can therefore

The configuration shown in longitudinal section in the drawing can be set for an optimal sealing effect,

examples of feeling explained in more detail. It shows the sealing rings 22 and 25 do not result in just one

Fig. 1 shows a first embodiment of an inventive 35 self-aligning bearing of the sliding rings, but

A mechanical seal according to the invention for an oil pump also ensures that no oil runs down the shaft 1

I. with rotating sliding rings that step outwards. The one connected to room 27

Fig. 2 cmc modified embodiment in the section between the two sealing rings 22 and

Lungs ·· Jiuitt and 25 is under less pressure, so that

F i g. 3 a third embodiment with stationary 40 sealing with the aid of the ring 25 no difficulty

Cilei rings. makes. Should for some reason the

In I ig. If a pump shaft 1 consisting of a first sliding ring 18 fails, the second sliding ring

<ichäusc2 led out. It is assumed that ring 24 is still used as an emergency seal.

β;: 1ι on the left side an electric drive- In the embodiment of F i g. 2 are

liiolor and on the right-hand side an oil pump lic fin- 45 identical parts with the same reference numerals as in

det. The shaft rotates in the direction of arrow 3 F i g. I provided. The following differences are

lind i'.l in the direction of tie., PL'les 4 elwas back and forth- essentially:

Vr - cliieh! I. The space 27 between the sliding rings 18 and 24

The liquid to be sealed is in is via holes 29 and 30 in the Geguilauf-

ciner l> ichtkammer 5. in which they are mainly connected 50 discs 10 with a housing back channel 31,

enters through a channel 6, the leakage and overflow via a non-return valve 32 to the pump suction

feeding oil from the pump valve. More oil carried on the side. There can be no oil in room 27

Reaches from geschniierleni shaft bearings 7 about a collection: this is rather always a pump

Ii! Mentioned ■ • chwinmieiides thrust bearing 8 pulled into the suction ropes. As a result, the opposing

iMchtkammer 5. The oil overflows; ^% inen channel 9 55 washer 10 still has a second sealing ring 33. the

tnr return ropes of the pump. Therefore there is in the - with the help of a pressure washer 34 in place

Scr chamber 5 is kept approximately the same pressure as in. The plate spring 26 is through several

the return line of the pump system. Coil springs 35 replaced in holes 36 of the

I ^ he chamber 5 is received to the outside by a stationary two Glcitringe 18 and 24 are. The counter-rotating disk 10 with a sealing ring 11 is evenly distributed around the circumference, closed by a plate spring 12, which is not only supported for pressing against a support ring 13 with a locking ring 14, the sliding ring 24, but also cause his co-opposition to strike! ^r ; Ie held on the housing would take during the rotary movement by the glass ring 18. is. The counter-rotating disk carries a layer 15 of Also in the embodiment of FIG. 3 a wear-resistant material, on whose surface 65 the same reference is used for similar parts, a sliding surface 16 in a cb: iicn ring surface as in FIGS. 1 and 2. When this is trained. Construction is the counter-rotating disk 10 strong

Fmncrn the sealing chamber 5 is connected to the shaft 1 and connected to it by means of a

Sealing ring 40 sealed. The shaft has a circumferential groove 38 in which a locking ring is clamped is. Tiine Mitnelimerscheibe 39 engages with a first nose in a hole animal gcgetilatifselieibe 10 and with a / wide nose behind a stop of the locking ring. The return disk 10 is through the Gleitrinsidiehiingsfedcr 19 and pressed by the liquid pressure in the chamber 5 against the crimping ring and thereby in a exactly vertical plane with respect to the Wellcnaclisc held.

Since the two sliding rings 18 and 24 are held stationary, the second sliding ring encloses 24 the first sliding ring 18 in the area of its sliding surface. A sealing ring 41 and 42 is located between each the two sliding rings and the inner circumferential housing wall 43. The sealing rings allow a Self-alignment of the two glass ringsc. You mad l '-.- i an axial displacement (him IkvintriichtiiMirit' der DichUvktenu "! / wischen I infant" and and / line in (Heilring.

The leather 19 is with a Na-.e 44 in the channel 9 hung up and embraced with her softer idea 45 a plate 46. the rotating test connected to the first sliding ring 18 iM. In this way, the Slide seal spring 19 at the same time for it. dat> the Cileitring 18 does not turn. As a result, rotates

ίο the second sliding ring 24 does not move either because it is held by the springs 35 in a rotationally fixed manner with respect to the first sliding ring. With this arrangement, no rotating abutment for the spring 19 is necessary.
The gliding flutes on the counter-rotating disc 10, which interact with the two sliding rings, can also be axially offset from one another. Ms can also be connected in series with more than two sliding channels.

1 sheet of drawings

Claims (4)

Patent claims: 1. Mechanical seal for oil pump », for the two concentric, in the Dicluweg intersected! eschallcte Glciliinge springy against a common seed Counter-rotating disk are pressed, whereby the downstream / wide sliding ring is resilient in order to reap the benefits of a sliding ring in one On my side recess of the other is arranged and each gliding flight on a Uniiangsfläche trusts a dichiring, marked due to the combination of the following features: a) The / wide sliding ring is in one through a stem-side recess of the first sliding ring. the Geuenlauisclieibe and the circumference ¹ S of the shaft or the housing bore arranged limited space, and b) both slide channels are themselves aiisrii · via their sealing rings; tend on the wave or on Housing supported. 2. Mechanical seal according to claim 1, wherein the material of the two seal rings opposite one another Counter-rotating disk surface is uniform, characterized in that the material of the two sliding ring surfaces is so different. that is on the first sliding surface a material pairing of higher wear-resistant wedge and one on the / wide sliding surface Material pairing with lower friction, preferably with emergency running properties, er'ibt. 3. Mechanical seal according to claim 1 or 2, in which the space / wipe the two slip rings is connected to a duct leading to the outside. characterized in that the Channel r.ii of the pump outlet in connection stands. 4. Mechanical seal according to claim 3, characterized in that a check valve in the channel is provided.